Many homes have more than one roof type built above a single exterior wall. One common example is a reverse gable roof, created when a house has gable walls that are perpendicular to one another, as in an L-shaped home.
We can create a reverse gable roof on an L-shaped home using the Break Wall 
tool.
To create a reverse gable in this plan, we need to create three gable walls: two running vertically and one horizontally.
Built this way, the gable wall on the left produces roof planes that extend too high and interfere with the roof over the lower part of the house. To correct this, use the Break Wall 
tool to break the left wall into two different sections. We can then specify the upper section as Full Gable without affecting the lower section.
and click the far left wall at a point even with the lower right wall. Extension snaps should help you place the break at the right place. See "Extension Snaps".
tool, check Build Roof Planes and click OK to build a roof based on the new wall specifications.You now have two full gable roof sections meeting to form your L-shaped roof. Your plan should look like the following image:
Notice the step in the ridge line. This can be corrected by resizing the lower gable wall. Select the vertical wall to the right of the lower gable wall and move it to the left 2 feet, reducing the length of the gable wall from 20 to 18 feet. When you are finished, rebuild the roof.
This completes the Roof Tutorial. You can use any combination of the techniques described here to create more complex models.
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to open a new plan.
tool to open the Build Roof dialog.